<html><head><title>alter table</title><meta name="HandheldFriendly" content="True"></head><body><div align="center"><h3><b>Constraints<br>alter table statement</b></h3></div><br><table><tr><td valign=top>1</td><td><a href="y307260.html">Add a constraint</a></td></tr><tr><td valign=top>2</td><td><a href="y307267.html">Drop a constraint</a></td></tr></table></body></html>